dsh-presets-hidden: DeepSeek Harness Browser-Side Preset Display and Sorting Plugin

The DeepSeek Harness plugin dsh-presets-hidden is designed to address the visual clutter caused by the official preset selector when many custom presets are present. By taking over the rendering logic on the browser side, it provides refined search, show/hide filtering, toggles, and sorting controls under "Settings -> Preset Display," with support for persistent configuration and data migration. It improves preset management efficiency, enabling developers to focus more on implementing Agent logic.